Rationalists wear square hats

VI
Rationalists, wearing square hats,
Think, in square rooms,
Looking at the floor,
Looking at the ceiling.
They confine themselves
To right-angled triangles.
If they tried rhomboids,
Cones, waving lines, ellipses –
As, for example, the ellipse of the half-moon –
Rationalists would wear sombreros.

Six Significant Landscapes, Wallace Stevens